The singer has been taking part in the Leadership Conference at the Royal Albert Hall which is organised by HTB Church in London.
Addressing the thousands in attendance he said: "I love Jesus and I always will."
He was on stage to interview Robi Damelin and Tatiana Viviene Bangue - two people working toward reconcilliation and forgiveness in conflict areas.
Talking about how we should be approaching these issues, he suggested a good starting point was the teachings of Jesus.
Marcus Mumford is the son of Vineyard church leaders John and Eleanor Mumford.
His faith has come up in numerous media interviews.
When asked by Rolling Stone magazine whether he would consider himself a Christian, he said: "I don't really like that word. It comes with so much baggage.
"So, no, I wouldn't call myself a Christian. I think the word just conjures up all these religious images that I don't really like."